<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <ul>
        <li v-for="(item,index) in list" :key="item.id">{{item.name}}</li>
      </ul>
      <button @click="go()">走一走</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: '#app',
        data: {
          list: [
            { id: 1, name: '帅哥' },
            { id: 2, name: '美女' },
            { id: 3, name: '程序员' },
          ],
        },
        methods: {
          go() {
            this.list.push(this.list.shift())
            // this.list.map((item, i) => {
            //   if (i === 2) {
            //     this.list.unshift(this.list.splice(i, 1)[0])
            //   }
            // })
          },
        },
      })
    </script>
  </body>
</html>
